<p>I've noted this flaw in the question and asked them to add a feature where it warns you about this issue.</p><p>They won't do Tg135-140 for 8L, only Tg155, so it's correct there.</p><p>For 10L and up they use S1000-2M instead, which they refer to as Tg170 (it's actually Tg180 according to the datasheet, so I've posted another question about that discrepancy), and their impedance calculations correctly assume that material, so the issue is avoided here. It's only the 4L and 6L boards that are affected.</p>
